BULL. GEOL. SOC. AM. 



VOL. 16. 1904, PL. 61 



Figure 1. — Weathered Olivine in Steatite, Mill Creek, near Black Rock Quarry 



Figure 2.— Olivine Crystals in Steatite, Lafayette Quarry 



Figure 3.— Serpentinized Olivine in Steatite 



SPECIMENS OF STEATITE FROM MONTGOMERY COUNTY, PENNSYLVANIA 

 From the Theodore D. Rand collection, Bryn Mawr College. Photographs by J. Volney Lewis 



